python - 如何在 Python 的类中更改全局变量的值？

Question

我想为全局变量分配一个新值，但它不起作用

email = " "
class A():
    def __init__(self):
        ---some code---
    def assign_email(self):
        email = "[e-mail]"
class B()
    def __init__(self):
        print(email)            #this returns an empty string, not the updated value "[e-mail]"

标签： pythonclassvariablesglobal-variables

Answer 1

您应该声明email是全局变量而不是本地变量。你可以这样做：
global email

email = " "
class A():
    def __init__(self):
        pass
        # ---some code---
    def assign_email(self):
        global email # this makes email to be the global email
        email = "[e-mail]"
class B():
    def __init__(self):
        print(email)            #this returns an empty string, not the updated value "[e-mail]"
a = A()
a.assign_email()
b = B()
print(email) # global email